ci: use latest stable rust #582

Job	Run time
build (ubuntu-latest, kprobe)	2m 43s
build (ubuntu-latest, kretprobe)	2m 52s
build (ubuntu-latest, fentry)	2m 54s
build (ubuntu-latest, fexit)	2m 39s
build (ubuntu-latest, uprobe)	2m 54s
build (ubuntu-latest, uretprobe)	2m 43s
build (ubuntu-latest, sock_ops)	2m 45s
build (ubuntu-latest, socket_filter)	2m 51s
build (ubuntu-latest, sk_msg)	2m 50s
build (ubuntu-latest, xdp)	2m 7s
build (ubuntu-latest, cgroup_skb)	2m 51s
build (ubuntu-latest, cgroup_sockopt)	2m 42s
build (ubuntu-latest, cgroup_sysctl)	3m 0s
build (ubuntu-latest, classifier)	2m 40s
build (ubuntu-latest, lsm)	2m 44s
build (ubuntu-latest, perf_event)	2m 47s
build (ubuntu-latest, raw_tracepoint)	2m 39s
build (ubuntu-latest, tp_btf)	2m 34s
build (ubuntu-latest, tracepoint)	2m 38s
build (macos-13, kprobe)	8m 45s
build (macos-14, kprobe)	2m 7s
	1h 2m 45s

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